1. A sample of a solution of acid A was analysed.

The tests on A, and some of the observations are in the following table.

Complete the observations in the table.

tests observations 1) The pH of the solution was tested using indicator paper orange,     pH 4 The solution was divided into three test-tubes 2) To the first portion was added a piece of magnesium ribbon. The gas was tested with a lighted splint. i) ..................................................      [2] 3) To the second portion of A was added sodium carbonate. The gas was tested with limewater. ii) ..................................................      [2] 4) To the third portion of liquid A was added a spatula measure of solid B. The mixture was boiled gently. By using a teat pipette the solution was transferred to another test tube. Excess aqueous ammonia was added. green solution formed dark blue solution formed